package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basepath;


    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info("上次文件：{}", file.toString());

        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suffix;

        // 创建一个目录对象
        File newFile = new File(basepath);
        // 判断当前目录是否存在
        if(!newFile.exists()) {
            // 目录不存在，需要创建
            newFile.mkdirs();
        }

        try {
            file.transferTo(new File(basepath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(fileName);


    }

    @GetMapping("/download")
    public void download(HttpServletResponse response, String name) {
        log.info("下载文件：{}", name);

        try {
            // 通过输入流从磁盘读取文件
            FileInputStream inputStream = new FileInputStream(new File(basepath + name));
            // 通过输出流写出到网络
            ServletOutputStream outputStream = response.getOutputStream();

            int length = 0;
            byte[] bytes = new byte[1024];
            while ((length = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, length);
                outputStream.flush();
            }

            outputStream.close();
            inputStream.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }


    }


}
